US 11,747,436 B2
Noise mitigation in radar systems
Karthik Subburaj, Bangalore (IN); Karthik Ramasubramanian, Bangalore (IN); Sriram Murali, Bangalore (IN); Sreekiran Samala, Plano, TX (US); and Krishnanshu Dandu, Allen, TX (US)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Sep. 15, 2020, as Appl. No. 17/20,931.
Application 17/020,931 is a continuation of application No. 16/114,490, filed on Aug. 28, 2018, granted, now 10,809,353.
Application 16/114,490 is a continuation of application No. 14/687,617, filed on Apr. 15, 2015, granted, now 10,101,438, issued on Oct. 16, 2018.
Prior Publication US 2021/0011118 A1, Jan. 14, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G01S 7/292 (2006.01); G01S 13/88 (2006.01); G01S 13/00 (2006.01); G01S 7/35 (2006.01); G01S 13/34 (2006.01); G01S 7/03 (2006.01); G01S 7/02 (2006.01); G01S 7/41 (2006.01); G01S 13/04 (2006.01)
CPC G01S 7/292 (2013.01) [G01S 7/023 (2013.01); G01S 7/038 (2013.01); G01S 7/354 (2013.01); G01S 7/414 (2013.01); G01S 13/003 (2013.01); G01S 13/343 (2013.01); G01S 13/88 (2013.01); G01S 7/356 (2021.05); G01S 7/358 (2021.05); G01S 13/04 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A circuit, comprising:
a transmitter configured to transmit a radar signal;
a receiver configured to receive a reflected radar signal, wherein the reflected radar signal includes an interferer signal that includes noise, and wherein the receiver comprises a mixer to generate a baseband signal in response to the received radar signal, wherein the baseband signal includes a real portion and imaginary portion;
an analog-to-digital converter (ADC) coupled to the mixer and configured to receive the baseband signal, the ADC further configured to generate a complex signal output having a real and an imaginary component;
an estimator coupled to the ADC and configured to receive complex signal output, estimate a value of noise in the interferer signal in the complex signal output, and generate an estimator output including a shift value;
a signal shifter in one of the transmitter and the receiver and configured to receive the estimator output, wherein the signal shifter is operable to shift the transmitted radar signal or the reflected radar signal by the shift value resulting in a shifted baseband signal; and
a multiplexer coupled to the signal shifter to select one of the real and imaginary portions of the shifted baseband signal.